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ExperienceWe finally got our hands on the Mass Mods UA1 last week and had a chance to sit down to get our hands on this slick mod to do some short-term usability testing. It has a solid feel with a very light weight to it, 147 grams without the batteries roughly about 5.2 oz. With two 18650s in it, it weighs 237 grams or roughly about 8.4 oz. If you're looking to carry something light and durable in your EDC arsenal, the UA1 will definitely fit the bill. The machining is smooth and the pieces fit together nicely with some nice strong magnets that keep the battery cover linked to the box.

Some initial details we noticed are the dual low resistance MOSFET transistors which is great because it keeps things nice and safe. All the wires are silicone and are definitely beefy enough for the electrical current that goes through it. Battery sleeves are gold plated and bent in so they won't mess up the sleeves for your batteries. The soldering is nice and clean. There's no button or battery rattle, which is great.

Now to go into detail about the switch...lets just say this mod is the safest unregulated box mod you could use, it has a capacitive safety which will not allow it to fire in any circumstance unless your finger is resting on it and pressing it simultaneously. It's never going to fire in your pocket, or fire on its own. All we have to say is that...the switch is awesome. It fires beautifully, the hit is great. Mass Mods definitely put in a lot of effort in this box mod and it really shows.

Although we are overall pleased with the UA1 it does have a few things that we might be overly nitpicky about: first of all is the packaging it comes in, for this higher valued product, we really wished it came with something that shows the innovation in its button design. The other nitpick we have with is, we wished that the 510 fitting sit flush against the box and the very minor battery cover movement that's only evident if you're actually trying to move it.